Recordings of diaphragmatic electromyograms during cryoballoon ablation for atrial fibrillation accurately predict phrenic nerve injury.

Background: Cryoballoon ablation has been associated with a significant incidence of phrenic nerve injury (PNI).

Objective: The purpose of this study was to evaluate whether recordings of diaphragmatic compound motor action potentials (CMAP) on a modified lead I during cryoballoon ablation can predict PNI.

Methods: Cryoballoon ablation was performed in 109 patients with atrial fibrillation (AF).